Texas Instruments UCC28221EVM

Overview

UCC28221EVM from Texas Instruments is a 200-W evaluation module implementing a dual-channel interleaved forward converter topology, accepting 36–76 V_DC input and delivering regulated 12 V_DC output at up to 16.7 A. It integrates the UCC28221 dual PWM controller and UCC27324 gate driver to enable ripple cancellation, reduced magnetic size, and high-frequency (500 kHz) operation for industrial power supply development.

For engineers reviewing the UCC28221EVM datasheet, UCC28221EVM layout, UCC28221EVM performance curves, or UCC28221EVM thermal management requirements, this module supports rapid validation of interleaved forward designs targeting efficiency, transient response, and EMI-sensitive applications in telecom and server power systems.

Technical Context

The UCC28221EVM implements two isolated 100-W forward stages operating 180° out-of-phase at 500 kHz, enabling output current ripple cancellation and allowing higher-output-capacitor ESR tolerance. Its design leverages the UCC28221's programmable per-channel max duty cycle (up to 90%) and integrated 110-V JFET startup circuit to eliminate external bootstrap resistors.

Operation requires ≥50 W minimum load and active cooling to maintain ambient ≤40°C; input voltage must stay within 36–76 V_DC to prevent damage. Measured efficiency reaches 92% at 200 W with 48 V_IN, and output ripple is ≤500 mV_pp under full load.

Key Specifications

Availability

UCC28221EVM is available at Aetrix Electronics and suitable for telecom rectifier validation, server auxiliary power design, and industrial DC-DC converter prototyping requiring stable component supply and documented reference performance.

Supply support for UCC28221EVM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and communications markets.

The UCC28221EVM belongs to TI's System Power Evaluation Module family, designed specifically to accelerate development of high-efficiency, high-frequency isolated DC-DC converters using TI's dual-channel PWM controllers.

FAQ

What is the primary purpose of the UCC28221EVM?

The UCC28221EVM is an engineering evaluation module built to demonstrate and validate the UCC28221 dual interleaved PWM controller in a 200-W, 500-kHz, two-channel forward converter. It enables power designers to assess efficiency, transient response, ripple cancellation, and thermal behavior without developing a custom board-supporting rapid iteration for telecom and industrial 12-V power systems.

Does the UCC28221EVM require external startup circuitry?

No-the UCC28221EVM uses the internal 110-V JFET startup circuit of the UCC28221 controller, eliminating the need for an external trickle-charge resistor. This feature reduces component count and improves reliability in high-volume designs where the UCC28221EVM serves as a functional reference for production layouts.

What are the mandatory operating conditions for safe use of the UCC28221EVM?

The UCC28221EVM requires a minimum 50-W load and forced-air cooling to maintain ambient temperature at or below 40°C. Input voltage must remain strictly within 36–76 V_DC; exceeding this range may cause irreversible damage. High-voltage nodes are exposed-power must be disconnected and input capacitors discharged before handling.

How does interleaving improve performance in the UCC28221EVM?

By operating two 100-W forward stages 180° out-of-phase, the UCC28221EVM cancels output current ripple, reducing RMS current stress on output capacitors and allowing higher-ESR, lower-cost tantalum or polymer capacitors. This also cuts input filter requirements and improves transient response compared to single-channel equivalents.

Can the UCC28221EVM be used for compliance testing (e.g., FCC, UL)?

No-the UCC28221EVM is explicitly intended for engineering development only and is not regulatory-certified. As stated in TI's EVM IMPORTANT NOTICE (Category B), it lacks end-product safety features, EU EMC/LVD compliance, and agency certifications (FCC, UL, etc.). It must not be deployed in commercial or safety-critical systems without full redesign and certification.